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The genetic relationship among plant-height traits found using multiple-trait QTL mapping of a dent corn and popcorn cross.

Authors :
Yuling Li
Yongbin Dong
Suzhun Niu
Dangqun Cui
Source :
Genome. Apr2007, Vol. 50 Issue 4, p357-364. 7p. 4 Charts, 2 Graphs.
Publication Year :
2007

Abstract

Plant height (PH) is one of the most important traits in maize breeding programs. In popcorn, inferior plant traits can be improved with the dent/flint corn germplasm. In the current study, a total of 259 F2:3 families, developed from a cross between a dent corn inbred and a popcorn inbred, were evaluated for 4 PH traits. Quantitative trait loci (QTLs) for each trait were detected using composite interval mapping methods. In addition, genetic interrelationships were investigated using multiple-trait joint analysis for PH with ear height (EH), and for PH with top height (TH). In total, 6, 5, 2, and 6 QTLs were identified for PH, EH, TH, and TH/PH in single-trait analysis, respectively. Joint-analysis data suggest a strong and complex genetic relationship between PH and EH, and between PH and EH, with no QTLs controlling any single trait independently. In addition, 4 kinds of QTLs detected were classified as closely linked QTLs, pleiotropic QTLs, QTLs with opposite effects, and additional QTLs. It was, consequently, difficult to improve lodge resistance through selection on any individual PH trait. The current study demonstrates that multiple-trait joint analysis not only identified additional QTLs, but also revealed the genetic relationship among different highly correlated traits at the molecular level. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08312796
Volume :
50
Issue :
4
Database :
Academic Search Index
Journal :
Genome
Publication Type :
Academic Journal
Accession number :
26232459
Full Text :
https://doi.org/10.1139/G07-018